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New candidates for the future: 59 Ge 62,63 Se 66,67 Kr 70,71 Sr 74,75 Zr …. What can we learn from two-proton radioactivity: masses of nuclei beyond drip line pairing in nuclei sequence of single-particle levels deformation tunneling process BUT: Is this really a physics topic for an ISOL facility? short half-lives  long extraction times secondary fragmentation  very far from stability